EP0028913B1 - Apparat zur Reinigung von Flüssigkeiten durch umgekehrte Osmose - Google Patents

Apparat zur Reinigung von Flüssigkeiten durch umgekehrte Osmose Download PDF

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Publication number
EP0028913B1
EP0028913B1 EP80303933A EP80303933A EP0028913B1 EP 0028913 B1 EP0028913 B1 EP 0028913B1 EP 80303933 A EP80303933 A EP 80303933A EP 80303933 A EP80303933 A EP 80303933A EP 0028913 B1 EP0028913 B1 EP 0028913B1
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EP
European Patent Office
Prior art keywords
fluid
cylinder
pistons
module
pressure
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80303933A
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English (en)
French (fr)
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EP0028913A1 (de
Inventor
Leslie Peter Stuart Wilson
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Sykes Ocean Water Ltd
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Sykes Ocean Water Ltd
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Publication of EP0028913A1 publication Critical patent/EP0028913A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/06—Energy recovery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/18—Specific valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/24—Specific pressurizing or depressurizing means
    • B01D2313/246—Energy recovery means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/90—Additional auxiliary systems integrated with the module or apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/90—Additional auxiliary systems integrated with the module or apparatus
    • B01D2313/903—Integrated control or detection device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2514—Self-proportioning flow systems
    • Y10T137/2516—Interconnected flow displacement elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/794—With means for separating solid material from the fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86718—Dividing into parallel flow paths with recombining
    • Y10T137/86759—Reciprocating
    • Y10T137/86767—Spool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87322—With multi way valve having serial valve in at least one branch

Definitions

  • This invention relates to apparatus for the purification of a liquid, such as water, by reverse osmosis.
  • a fluid such as seawater is forced by the ram into the module.
  • a valve is provided between the ram and the module to prevent return of fluid from the module on the return stroke of the ram; this may be a non-return valve or it may be a valve which is controlled by the fluid pressure or by the movement of the ram or in synchronism therewith.
  • On the forward stroke of the ram some water may pass through the membrane and the remainder of the fluid is returned to the rear face of the piston or diaphragm.
  • fluid may be forced into the module at a very high pressure such that water purification can be obtained.
  • a pressure of the order of 300 to 500 p.s.i. (2.1 x 10 3 to 3.4x 1 03 kPa) would be necessary whilst for seawater, since the osmotic pressure is higher, a pressure typically of the order of 600 to 1000 p.s.i. (4.1 x 10 3 to 6.9x 1 03 kPa) might be necessary.
  • the construction described above enables these high pressures to be obtained economically and efficiently because the return fluid from the membrane is applied to the rear surface of the piston or diaphragm.
  • This rear surface because of the presence of the operating rod, has a slightly smaller effective area.
  • the pressure in the system builds up until a pressure is reached at which water will pass through a membrane on each stroke in equivalent volume to the difference in volume between the rear and front ends of the cylinder due to the presence of the operating rod.
  • Power has to be supplied to the operating rod and the required work for each stroke depends only on the difference of the front and rear face areas, the pressure and the length of the stroke.
  • the device is thus self-regulating and tends to operate in a condition where the proportion of water passing through the membrane to the total inlet fluid is equal to the ratio of the operating rod cross-section to the piston or diphragm front face area. There is thus no need for any pressure regulation by relief valves. No adjustment is required for variations of salinity and the same equipment may be used for seawater as for slightly brackish water. Although it is convenient to refer to water, the apparatus may be used for reverse osmosis treatment of other fluids.
  • apparatus for the reverse osmisis purification of water or other fluid comprises a fluid supply, a module including a reverse osmotic membrane, a fluid inlet and fluid outlet for passage of fluid over one surface of the membrane and an outlet for the passage of purified fluid out of the module from the opposite surface of the membrane together with a plurality of similar cylinders each having a piston or diaphragm dividing the cylinder into a front end and a rear end, a separate valve to the fluid inlet of the module for each cylinder, each said cylinder with its piston or diaphragm being arranged for forcing fluid from the front face of the piston or diaphragm through said separate valve to the fluid inlet of the module at least one operating rod mechanically interconnecting said pistons or diaphragms, which operating rod or rods extend from the rear faces of said pistons or diaphragms whereby said pistons or diaphragms mechanically operate in a cyclic sequence, and valve means for the front end of each
  • the pump means supply the fluid to be treated to the front ends of the various cylinders for subsequent forcing at high pressure into the module.
  • This fluid from the pump means provides the necessary driving power for operating the pistons or diaphragms in the various cylinders. There is thus no need for any gearbox or mechanical drive to the pistons or diaphragms. If there are three or more cylinders, the pistons or diaphragms may have their operating rods interconnected by a crank- shaft; this crank-shaft however is free-running, the drive power coming from the pump.
  • said controlled valve means is operative selectively to connect the fluid outlet from the module to the rear end of one cylinder and to connect the rear end of the other cylinder to a discharge or vice versa
  • control means are provided for said controlled valve means operative to change-over the connections when the pistons or diaphragms reach the end of a stroke whereby the pistons are driven by fluid from said pump means applied to the front end of each of the two cylinders alternately and serving to overcome the difference in fluid pressures on the front and rear faces of the piston in the other cylinder.
  • the aforesaid separate valves through which fluid is forced from the front face of the piston or diaphragm to the module are conveniently non-return valves but they could be further valves controlled by said control means.
  • the pump means can be a continuously running pump, conveniently an impeller or gear or vane pump.
  • the outlet from this pump need only be at a very low pressure compared with the pressure required in the module and might typically be 80 p.s.i. ' (5.5x 1 02 kPa).
  • This output is applied through non-return valves to the front ends of both rams (considering a system with only two cylinders).
  • One of these rams has its rear end connected to discharge.
  • the other ram has its rear end connected to the high pressure outlet from the module.
  • the two rams are interconnected by the common operating rod. Considering the ram with its rear end connected to discharge, the piston or diaphragm will tend to move towards the rear end.
  • the pump pressure, applied, over the whole front fact, will exert a force on the operating rod, which force is applied to the other piston or diaphragm and is additive with the return fluid pressure from the module on the rear face of that piston or diaphragm. Movement of the two pistons or diaphragms thus takes place if the required module pressure is developed on the front face of the second piston or diaphragm, i.e. if the force in the operating rod is sufficient to overcome the effect of the different areas of the front and rear faces which are both subject to the module pressure. It will thus be seen that the required pump pressure is a fraction of the required module pressure determined by the ratio of the cross-sectional areas of the operating rod and of the piston.
  • the apparatus will inherently operate at a module pressure such that the extraction ratio is equal to the ratio of the cross-sectional areas of the operating rod and piston. If the extraction ratio is less than this, then the volume of return fluid fed to the rear face of a piston will be greater than can be accommodated by movement of the piston to force the appropriate volume of fluid into the module. The pressure inherently builds up to give the required extraction ratio. In the apparatus of the present invention, no movement of the pistons will occur until the pump pressure has built up to the necessary pressure to provide the required operating force.
  • the non-return valve will be closed between the pump and that one of the cylinders which is supplying pressure fluid to the module.
  • the other non-return valve will be open but fluid will only flow from the pump to-the cylinder when the required pressure has developed. It is thus possible to use any pump means which will develop the required fluid pressure, which, as previously indicated, would typically be about 80 p.s.i. (5:5x10 z kPa). Flow will commence when the required pressure is reached. It will be seen that the pressure throughout the system are self-regulating; both the extraction ratio and the ratio of pump to module pressure are predetermined by choice of the ratio of operating rod cross-section to piston area.
  • the controlled valves have to change-over at or near the end of each stroke.
  • These valves might be electrically operated or mechanically operated or hydraulically operated. Very conveniently hydraulic operation is employed, making use of the rise in pressure in the output from the pump at the end of a stroke (when flow must cease). As soon as the valves change-over, the pressure will fall and thus there is a pressure-pulse at each end of each stroke.
  • a reversing actuator e.g. a semi-rotary flow reversing device, is provided which on one pulse, sets the valves in one position and, on the next pulse, reverses the valve positions.
  • other means may be employed for detecting the end of a stroke, e.g. inductive sensing means for detecting the position of the piston; such means would conveniently be employed to control electrically operated valves.
  • the controlled valves may be spool or piston valves. They have to control fluid which may be at the module pressure. To operate such valves from the pump outlet fluid, it may be preferred to use pressure intensifying means.
  • the controlled valves are operated hydraulically by a spool valve and the rise in pressure at the end of each operating stroke of the main pistons is utilised to effect reversal of the'spool valve.
  • the two main cylinders may be mounted back-to-back. There would be no need for any bearings for the operating rod between the cylinders and only one seal, on this operating rod, would be necessary. There is no need for any tight seal between the pistons and cylinders because the pressures on the two sides of each piston are nearly equal if the cylinder is subject to module pressure.
  • a reverse osmosis liquid purification module having a membrane 11 in a housing 12 with a fluid inlet 13 and fluid outlet 14-ort one side of the membrane and a purified liquid outlet 15 on the other side of the membrane.
  • This module may be constructed in the known manner, for example having a sheet of cellulose acetate or polyamide membrane material wound spirally with a liquid-conducting backing sheet around a perforated tube which receives the purified liquid.
  • the known hollow fibre construction may be employed.
  • a rotary pump 20, e.g. an impeller pump or gear pump or vane pump driven by an electric motor feeds liquid to be purified at a pressure typically of 80 p.s.i. (5.5x 1 02 kPa) to ducts 21, 22 leading respectively via non-return valves 23, 24 to the front ends of two cylinders 25, 26 having pistons 27, 28 respectively.
  • the fluid may be available under a suitable pressure without a pump, e.g. a water supply from a dam.
  • These cylinders 25, 26 are aligned and the pistons are joined by a rigid connecting rod 29 extending between the rear faces of the two pistons.
  • valves 30,31 the rear end of cylinder 25 is connected selectively either to the module outlet 14 or to a discharge 32.
  • valves 33, 34 By means of valves 33, 34, the rear end of cylinder 26 is connected selectively either to the module outlet 14 or to the discharge 32.
  • the valves 30, 31, 33 and 34 are controlled in synchronism with the operation of the pistons so that they change-over at or near each end of each stroke.
  • control means 40 are changed over by control means 40.
  • control means 40 may be electrical, e.g. microswitches controlling solenoids operating the valves, or mechanical or hydraulic.
  • the apparatus will develop a pressure in the module such as will give an extraction ratio corresponding to the ratio of the operating rod section to the piston area. This ratio will also determine the pressure which will have to be developed by pump 20 to effect measurement of the pisions.
  • the apparatus is self-regulating in this respect, inherently developing the required pressures.
  • Figure 2 illustrates a hydraulically operated system.
  • Figure 2 there is shown a reverse osmosis system in many ways similar to that of Figure 1 and the same reference characters are used to indicate corresponding elements.
  • this arrangement use is made of the pressure pulse which occurs in the output from the pump 20 at the end of each stroke. When the pistons stops moving, the pressure will rise but, since the valves are then immediately actuated in a manner to be described later, the pressure falls again and thus there is in effect a pressure pulse at each end of each stroke.
  • This pressure pulse is applied to a pulse actuator 45 and has a spring-loaded piston set so that it will jump open at a predetermined pressure.
  • This pulse actuator operates a semi-rotary reversing switch 46 which switch, in one position connects the output of the pump 20 to one side 47 of a pressure intensifier 48, and, in the other position, connects the output of the pump to the other side 49 of the pressure intensifier.
  • the side of the pressure intensifier to which the pump pressure is not employed is connected by the reversing switch to a discharge 50.
  • the intersifier provides output at typically 1000 p.s.i. (6.9 x 101 kPa) on one or other of two lines 51, 52 according to the setting of the reversing switch.
  • the output on line 51 controls spool or piston valves 53, 54 for the rear end of cylinder 25 whilst the output on line 52 controls spool or piston valves 55, 56 for the rear end of cylinder 26.
  • These valves are operated as previously described so that the rear end of each cylinder is connected either to the module outlet or to the discharge 32 according to the required direction of movement of the pistons.
  • Figure 4 illustrates another arrangement in which a solenoid 70 having operating rods 71, 72 actuates ball valves 74, 75 for controlling the connection of the rear face of one cylinder either to the module or to discharge as required.
  • the solenoid is operated by sensor 76 which might for example be an inductive sensor sensing the position of the piston. Separate induction coils may be provided at each end of the cylinder to provide sensing signals indicative of when the piston has reached the ends of the cylinder. It will be appreciated that it is merely necessary to sense when the piston is approximately at the end of the cylinder. The actual length of travel for each stroke is not critical. However the valves on the two cylinders will have to be operated simultaneously and thus one sensing system will be used to control the solenoid for operating the valves on both cylinders.
  • FIG. 5 there is illustrated a construction in which the pressure rise at the end of the stroke is used not to operate directly valves controlling the ports for the main cylinder but to operate a spool valve controlling piloted valves for these ports.
  • a pilot piston and cylinder 80 controls valves 81 and 82 such that one of these valves is opened when the other one is closed and vice versa.
  • the valve 81 connects the rear end of cylinder 25 to discharge whilst the valve 82 connects the rear end of that cylinder to the outlet 14 from the module.
  • a second piloted valve comprises a. piston and cylinder 83 operating valves 84, 85 such that one valve is open when the other is closed and vice versa.
  • the valve 84 connects the rear end of cylinder 26 to the outlet 14 from the module 10 whilst the valve 85 connects the rear end of cylinder 26 to the discharge.
  • the two piloted valves 80, 83 are operated in synchronism by applying pressure, as will be described later, to lines 86, 87 leading to one side of the pistons in these piloted valves and connecting the other sides via lines 88, 89 to discharge or, by applying the pressure to lines 88, 89 and connecting lines 86, 87 to discharge, forcing the piloted valves into their opposite position.
  • This operation is achieved by means of a spool valve 90 having three spools 91, 92, 93 on a common connector rod 94 which forms the armature for a solenoid 95.
  • Inlet pressure from the pump 20 is applied to an inlet port 96 and, according to the position of the spool valve, this pressure is applied either via an outlet port 97 to the aforementioned connectors 86, 87 or via an outlet port 98 to the aforementioned connector leads 88, 89.
  • Outlets 100, 101 from the spool valve lead to the discharge and serve to connect the appropriate one of the ports 97, 98 to discharge when the other port is subjected to the pump pressure.
  • the solenoid is operated by means of a timer or by means of a proximity sensor on the main pistons 27, 28 or by a pressure-operated switch 105, as indicated diagrammatically in Figure 5, this switch responding to the increase in pressure at the outlet of the pump 20 at the end of the stroke serving to effect an electrical connection energising the solenoid to reverse the spool valve.
  • the spool valve may be moved in one direction or the other electrically, e.g. by providing separate solenoids for each direction of movement or the movement in one direction may be effected by the solenoid and movement in the opposite direction by a spring indicated diagrammatically at 106.
  • a timing device for operating the associated spool valve for each double cylinder device.
  • Such an arrangement may also be used in a radial system, as previously described, having three or more cylinders operated in sequence.
  • Figure 6 illustrates another construction in which the rise in pressure of the water from the pump 20 at the end of the stroke is utilised to effect operation of a spool valve controlling the piloted valves.
  • the spool valve 90 and the piloted valves 80, 83 are similar to those described with reference to Figure 5 and the same reference characters are used to indicate corresponding components.
  • reversing of the spool valve 90 is effected by means of a reversing mechanism comprising a fixed cylinder 110 having a piston 111 which is urged in one direction by means of a spring 112. The piston is movable in the opposite direction under the influence of the pressure from the pump 20 via line 113.
  • the spring 112 is arranged so that normally it holds the piston 111 at the right-hand end of the cylinder as seen in the drawing when the pump 20 is providing the normal output pressure which is, in this particular embodiment, 60 p.s.i. (4.1 x 10 2 kPa).
  • the output pressure from the pump 20 will rise. This output pressure is applied to the piston 111 and overcomes the spring forces to drive the piston to the left.
  • the piston carries a flexible needle 120, which is typically a stainless steel wire, stiffened along part of its length remote from the piston 111, this stiffening being effected by a thin bore metal tube 121 surrounding the wire.
  • the wire is terminated in a small ball or loop 123.
  • the needle is thus flexible only in the region close to the piston 111.
  • This needle cooperates with a cam 130 having cam surfaces in the form of a letter W, the surfaces being curved and having a central upstanding part 131 and outer upstanding parts 132, 133.
  • the cam is pivoted on a fixed pivot 134 and is rotatable through 45° in either direction so that it is movable into either one or other of the positions shown in Figures 6a and 6b.
  • Figure 6 shows the cam in a neutral position. In normal operation it is, as explained below, forced into one or other of the positions shown in Figure 6a or 6b.
  • This cam has pivoted thereto at 138, a connecting rod 139 for effecting linear movement of
  • the spool valve 90 is preferably arranged so that the pressure port 96 of the spool does not admit pressure to the chambers on one or other side of the central spool 92 until the outer spools 91, 93 have covered or uncovered the ports 97, 98 leading to the piloted valves 80, 83.
  • This ensures that 0-rings or other seals on the spools are under zero pressure as they pass the ports in the walls of these chambers.
  • Each port 97, 98 is arranged as a number of small apertures extending around the circumference of the body of the valve in each porting position. Thus very small holes can be used so minimising the intrusion of such 0-rings into these holes.
  • the centre port 96 is under pressure from the pump 20 all the time and thus intrusion into the holes providing the centre port is impossible. The outermost ports leading to discharge are never under pressure and so need not be protected in this way.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Nanotechnology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Claims (10)

1. Gerät zur Reinigung von Flüssigkeiten, insbesondere von Wasser, durch umgekehrte Osmose
-mit einer Flüssigkeitszuführung,
-mit einem Modul (10), welches eine Membran (11) zur umgekehrten Osmose, einen Flüssigkeitseinlaß (13) und einen Flüssigkeitsauslaß (14) für den Flüssigkeitsdurchfluß über eine Oberfläche der Membran (11) sowie einen Auslaß (15) für den Austritt gereinigter Flüssigkeit von der entgegengesetzten Oberfläche der Membran (11) aus dem Modul (10) umfaßt,
-mit einer Mehrzahl gleichartiger Zylinder (25, 26) mit jeweils einem Kolben oder einer Scheibe (27, 28), durch den bzw. durch die der betreffende Zylinder in einen vorderseitigen und einen rückseitgen Endbereich unterteilt ist,
-mit jeweils einem zu dem genannten Flüssigkeitseinlaß (13) des Moduls (10) führenden separaten Ventil (36, 37) für jeden Zylinder (25, 26), wobei jeder Zylinder (25, 26) mit seinem Kolben oder seiner Scheibe (27, 28) derart angeordnet ist, daß er Flüssigkeit aus dem vorderseitigen Endbereich durch das zugehörige separate Ventil (37 bzw. 36) zu dem Flüssigkeitseinlaß (13) des Moduls (10) zu treiben vermag,
-mit wenigstens einer Betätigungsstange (29), die die Kolben oder Scheiben (27, 28) der Zylinder mechanisch miteinander verbindet und die sich von den Rückseiten der Kolben oder Scheiben (27, 28) aus erstreckt, so daß die Kolben oder Scheiben (27, 28) mechanisch in einer zyklischen Folge arbeiten,
-sowie mit einer den vorderseitigen Endbereichen der einzelnen Zylinder (25, 26) zugeordneten Ventileinrichtung (23, 24), gekennzeichnet durch
-eine Pumpeinrichtung (20), welche Flüssigkeit unter Druck von der Flüssigkeitsversorgung über die genannte den vorderseitigen Endbereichen der Zylinder zugeordnete Ventileinrichtung bildende Rückschlag- oder gesteuerte Verteilventile (23, 24) zu den vorderseitigen Endbereichen jedes Zylinders zu treiben vermag,
-sowie eine gesteuerte Ventileinrichtung (30-34, 40 oder 30-32, 45-56 oder 60 bis 66 oder 70 bis 72 oder 74 bis 76 oder 90 bis 98, 100, 101, 105, 106 oder 80, 83, 90-93, 97, 98, 104, 110 bis 113, 120 bis 123, 130-134, 138, 139), die aerart selektiv betätigbar ist, daß sie den rückwärtigen Endbereich jedes Zylinders (25 oder 26) synchron mit der genannten zyklischen Folge abwechselnd mit dem Flüssigkeitsauslaß (14) des Moduls und einem Ausfluß (32) verbinden, so daß die Kolben oder Scheiben (27, 28) der Zylinder (25, 26) durch den aufgebrachten Flüssigkeitsdruck angetrieben werden.
2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß zwei Zylinder (25, 26) vorgesehen sind, die zueinander fluchtend angeordnet sind, und daß die Kolben oder Scheiben durch eine gemeinsame Betätigungsstange (29) miteinander verbunden sind.
3. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß drei oder mehr Zylinder vorgesehen sind und daß die Betätigungsstangen durch eine Kurbelwelle miteinander verbunden sind.
4. Gerät nach Anspruch 2, dadurch gekennzeichnet,
-daß die gesteuerte Ventileinrichtung derart selektiv wirksam ist, daß sie den Flüssigkeitsauslaß (14) des Moduls (10) mit dem rückseitigen Endbereich eines Zylinders (25 oder 26) und den rückseitigen Endbereich des anderen Zylinders (26 oder 25) mit einem Abfluß (32) verbindet oder umgekehrt
-und daß eine Steuereinrichtung (40 oder 45 bis 51 oder Fig. 3 oder Fig. 4 oder 86-98) für die gesteuerte Ventileinrichtung vorgesehen ist, mittels derer die Verbindungen umgeschaltet werden, wenn die Kolben oder Scheiben (27, 28) das Ende eines Hubs erreichen, so daß die Kolben oder Scheiben (27, 28) durch Flüssigkeit angetrieben werden, welche von der genannten Pumpeinrichtung (20) dem vorderseitigen Endbereich jedes der beiden Zylinder (25, 25) abwechselnd zugeführt wird, und die zur Beseitigung der Differenz zwischen den auf der Vorderseite und der Rückseite des Kolbens oder der Scheibe in dem anderen Zylinder herrschenden Flüssigkeitsdrücke dient.
5. Gerät nach Anspruch 4, dadurch gekennzeichnet, daß die separaten Ventile (36, 37), durch welche Flüssigkeit von der Vorderseite des Kolbens oder der Scheibe zu dem Modul getrieben wird, Rückschlagventile (36, 37) sind.
6. Gerät nach Anspruch 4, dadurch gekennzeichnet, daß die gesteuerte Ventileinrichtung (80 bis 89) in Abhängigkeit von dem Druckanstieg in der Flüssigkeitszuführung am Ende eines Hubes gesteuert wird.
7. Gerät nach Anspruch 4, dadurch gekennzeichnet, daß die gesteuerte Ventileinrichtung (70 bis 75) durch eine Sensoreinrichtung (76) zur Erfassung der Position der Kolben oder Scheiben (27, 28) gesteuert wird.
8. Gerät nach Anspruch 7, dadurch gekennzeichnet, daß die Sensoreinrichtung (76) ein elektrisches Siganl liefert.
9. Gerät nach Anspruch 4 gekennzeichnet durch
-eine hydraulische Einrichtung (45 bis 52 oder 60 bis 66) mit einem Spulenventil (48 oder Fig. 3) zur Betätigung der gesteuerten Ventileinrichtung (30-33)
-sowie eine auf den im Ausgang der Pumpeinrichtung am Ende eines Hubes der Kolben oder Scheiben vorhandenen Druckanstieg ansprechende Einrichtung (45) zu Betätigung des Spulenventils und damit der gesteuerten Ventileinrichtung.
10. Gerät nach Anspruch 9, dadurch gekennzeichnet, daß die gesteuerte Ventileinrichtung zwei getrennte hydraulische Antriebsorgane (Fig. 3) umfaßt, die jeweils einem der beiden Zylinder zugeordnet sind, daß jedes dieser Antriebsorgane zwei Ventile (65, 66) besitzt, von denen das eine bei einem gegebenen Zustand des zugeordneten Antriebsorgans geöffnet und das andere geschlossen ist und daß durch die Betätigung desd Antriebsorgans des geöffnete Ventil geschlossen und das geschlossene Ventil geöffnet wird.
EP80303933A 1979-11-05 1980-11-05 Apparat zur Reinigung von Flüssigkeiten durch umgekehrte Osmose Expired EP0028913B1 (de)

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DE2850663A1 (de) * 1978-11-22 1980-06-04 Hestermann Gerhard Geraet zur durchfuehrung der umkehrosmose (ii)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933147A1 (de) * 1999-07-20 2001-01-25 Aloys Wobben Verfahren und Vorrichtung zum Entsalzen von Wasser
DE19933147C2 (de) * 1999-07-20 2002-04-18 Aloys Wobben Verfahren und Vorrichtung zum Entsalzen von Wasser
DE10057613A1 (de) * 2000-11-21 2002-05-29 Aloys Wobben Verfahren und Vorrichtung zum Entsalzen von Wasser
DE10066033A1 (de) * 2000-11-21 2002-06-06 Aloys Wobben Verfahren und Vorrichtung zum Entsalzen von Wasser
DE10057613C2 (de) * 2000-11-21 2002-11-07 Aloys Wobben Verfahren und Vorrichtung zum Entsalzen von Wasser
DE10066033B4 (de) * 2000-11-21 2007-01-11 Wobben, Aloys, Dipl.-Ing. Verfahren und Vorrichtung zum Entsalzen von Wasser
CN102562723A (zh) * 2012-01-17 2012-07-11 王俊宝 自动差压泵
CN102562723B (zh) * 2012-01-17 2014-04-16 王俊宝 自动差压泵

Also Published As

Publication number Publication date
EP0028913A1 (de) 1981-05-20
JPS5681108A (en) 1981-07-02
AU6410880A (en) 1981-05-14
CA1156935A (en) 1983-11-15
AU540836B2 (en) 1984-12-06
US4367140A (en) 1983-01-04
DE3068813D1 (en) 1984-09-06
JPH0258968B2 (de) 1990-12-11

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